SECURITY REPORT · EXTENSHI SCAN
Vimium
Firefox extension·by Phil Crosby
0
/ 100 SAFETY SCORE
CAUTION
Mostly fine, but a few things worth reviewing before you install.
Automated analysis of publicly available code — not a professional security audit. It may produce false positives and does not prove an extension is unsafe or safe. Treat it as one signal among many. Disclaimer · Report an issue
How it ranks
Vimium's safety score vs every other extension we've scanned
Globally
66.59%of extensions carry more risk
Riskier ←→ Safer
Ranked across every extension we scan
In its category
56.59%of its category extensions carry more risk
Riskier ←→ Safer
Ranked within its category
Findings
36
median 38Lower is safer
Risky permissions
4
median 1Critical + high perms
Total permissions
14
median 4All declared perms
Critical findings
1
median 2Severity = Critical
Findings breakdown
Automated security signal · 36 distinct issues across 6 severities
36
distinct issues
detected
detected
Scanners reported 42 raw occurrences; repeats of the same issue at the same location are merged here. The list below shows every occurrence.
Critical13%
High13%
Needs Review00%
Medium2775%
Low719%
Info00%
Permissions requested
4 risky permissions of 14 total
1 critical permission require attention
This extension requests 14 permissions in total. 4 of them grant broad capabilities that are worth a careful look.
Critical
Access to all websites
Can read and modify content on every website you visit
High
View open tabs
Can see URLs and titles of all open tabs
High
Access browsing history
Can read and modify your complete browsing history
High
Execute scripts in pages
Can inject and execute JavaScript code in web pages
Medium
Access bookmarks
Can read and modify your saved bookmarks
Medium
Store local data
Can save data locally in the browser for persistence
Medium
Access session data
Can query and restore recently closed tabs and windows
Medium
Show notifications
Can display desktop notifications outside the browser
Medium
Monitor navigation
Can observe and track tab navigation events and URL changes
Medium
Read clipboard
Can read text and data currently on your clipboard
Medium
Write to clipboard
Can place content onto your clipboard
Low
Trigger searches
Can trigger searches using the default search engine
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Scan performed by extenshi.io · Jul 25, 2026· partial run (some scanners failed)
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